1. Department of Bacteriology; Osaka City University Medical School; Osaka Osaka 545 Japan
2. Japan Collection of Microorganisms; The Institute of Physical and Chemical Research (RIKEN); Wako Saitama 351-01 Japan
3. Department of Agricultural Chemistry, Faculty of Agriculture; The University of Tokyo; Bunkyo-ku Tokyo 113 Japan
4. Department of Microbiology; Gifu University School of Medicine; Gifu Gifu 500 Japan
5. Second Department of Internal Medicine; Gifu University School of Medicine; Gifu Gifu 500 Japan